NAME
intro — introduction to system calls
DESCRIPTION
This section describes all of the system calls.
All of these calls return a function result.
This result indicates the status of the call.
Typically, a zero or positive result indicates that the call
completed successfully, and -1 indicates an error.
The individual descriptions specify the details.
An error number is also made available
in the external variable
errno
(see
errno(2)).
Note:
errno
is not cleared on successful calls.
Therefore, it should be tested only after an error has been indicated.
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